Base Station Random-Access Multiplexing for Lower Data Delay
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Solution Overview
Problem
The challenge in wireless communication systems is to reduce data signal transmission delay, particularly in out-of-sync scenarios and unlicensed bands, to support ultra-reliable and low-latency communication (URLLC) services in 5G networks.
Innovation Solution
Multiplexing or concatenating signals for synchronization processing with data signals, including control information, during random access procedures to expedite data transmission and reduce carrier sensing delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If separate transmission is used for random access procedure signals and data signals, then signal processing is simplified, but data signal transmission delay increases
Solution Approach 1:
The patent combines the random access procedure signal (RAR) and the data signal into a single multiplexed transmission on the PDSCH channel. The RAR includes both the random access response information and the data signal payload, allowing the terminal to receive both synchronization signals and data in one transmission opportunity, thereby reducing transmission delay without significantly increasing processing complexity through standardized multiplexing techniques
2Loss of time
If frequent carrier sensing is performed, then channel availability is accurately detected, but transmission delay increases
Solution Approach 1:
The base station performs carrier sensing in advance before transmitting the multiplexed RAR and data signal. By conducting the sensing operation prior to transmission and incorporating the channel availability determination directly into the RAR structure, the system eliminates the need for repeated carrier sensing cycles, reducing delay while maintaining reliable channel detection through the preliminary sensing action
3Productivity
If dedicated RACH resource is allocated for each terminal, then access reliability is improved, but resource utilization efficiency decreases
Solution Approach 1:
The patent implements a universal RACH resource that can be shared by multiple terminals through the multiplexed RAR structure. The base station assigns a dedicated preamble to each terminal for reliable identification, but transmits all terminal responses through a single shared PDSCH resource. This approach maintains access reliability through dedicated preamble assignment while improving resource utilization efficiency by consolidating multiple responses into one transmission opportunity
Data Source
AI summary
A base station performing random access procedure, the base station includes a transmitter and a controller. The transmitter configured to transmit a protocol data unit which is a signal of the random access procedure and a second signal different from the first signal which is not signal of the random access procedure, the second signal being a downlink control signal of control plane. The controller configured to perform control such that control information is included in the first signal, the control information being for controlling transmission of the second signal.